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πŸ‘©β€πŸ’» Π§Ρ‚ΠΎ Ρ‚Π°ΠΊΠΎΠ΅ ΠΌΠ΅Ρ‚ΠΎΠ΄ map() Π² JavaScript ΠΈ ΠΊΠ°ΠΊ ΠΎΠ½ ΠΈΡΠΏΠΎΠ»ΡŒΠ·ΡƒΠ΅Ρ‚ΡΡ?

map() β€” это ΠΌΠ΅Ρ‚ΠΎΠ΄ массивов Π² JavaScript, ΠΊΠΎΡ‚ΠΎΡ€Ρ‹ΠΉ создаёт Π½ΠΎΠ²Ρ‹ΠΉ массив, прСобразуя ΠΊΠ°ΠΆΠ΄Ρ‹ΠΉ элСмСнт исходного массива ΠΏΠΎ Π·Π°Π΄Π°Π½Π½ΠΎΠΉ Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΈ.
Π˜ΡΡ…ΠΎΠ΄Π½Ρ‹ΠΉ массив Π½Π΅ измСняСтся.

➑️ ΠŸΡ€ΠΈΠΌΠ΅Ρ€:

const numbers = [1, 2, 3, 4, 5];

// Π£ΠΌΠ½ΠΎΠΆΠ°Π΅ΠΌ ΠΊΠ°ΠΆΠ΄Ρ‹ΠΉ элСмСнт Π½Π° 2
const doubled = numbers.map(num => num * 2);

console.log(doubled); // [2, 4, 6, 8, 10]


πŸ—£οΈ Π’ этом ΠΏΡ€ΠΈΠΌΠ΅Ρ€Π΅:

β€’ map() примСняСт Ρ„ΡƒΠ½ΠΊΡ†ΠΈΡŽ ΠΊΠΎ всСм элСмСнтам массива
β€’ Π’ΠΎΠ·Π²Ρ€Π°Ρ‰Π°Π΅Ρ‚ Π½ΠΎΠ²Ρ‹ΠΉ массив с Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Π°ΠΌΠΈ
β€’ ИдСалСн для прСобразования Π΄Π°Π½Π½Ρ‹Ρ… (Π½Π°ΠΏΡ€ΠΈΠΌΠ΅Ρ€, ΡƒΠΌΠ½ΠΎΠΆΠ΅Π½ΠΈΠ΅, Ρ„ΠΎΡ€ΠΌΠ°Ρ‚ΠΈΡ€ΠΎΠ²Π°Π½ΠΈΠ΅).

CodeBase | Frontend | #JS
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πŸ‘©β€πŸ’» Π§Ρ‚ΠΎ Ρ‚Π°ΠΊΠΎΠ΅ ΠΌΠ΅Ρ‚ΠΎΠ΄ map() Π² JavaScript ΠΈ ΠΊΠ°ΠΊ ΠΎΠ½ ΠΈΡΠΏΠΎΠ»ΡŒΠ·ΡƒΠ΅Ρ‚ΡΡ?

map() β€” это ΠΌΠ΅Ρ‚ΠΎΠ΄ массивов Π² JavaScript, ΠΊΠΎΡ‚ΠΎΡ€Ρ‹ΠΉ создаёт Π½ΠΎΠ²Ρ‹ΠΉ массив, прСобразуя ΠΊΠ°ΠΆΠ΄Ρ‹ΠΉ элСмСнт исходного массива ΠΏΠΎ Π·Π°Π΄Π°Π½Π½ΠΎΠΉ Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΈ.
Π˜ΡΡ…ΠΎΠ΄Π½Ρ‹ΠΉ массив Π½Π΅ измСняСтся.

➑️ ΠŸΡ€ΠΈΠΌΠ΅Ρ€:

const numbers = [1, 2, 3, 4, 5];

// Π£ΠΌΠ½ΠΎΠΆΠ°Π΅ΠΌ ΠΊΠ°ΠΆΠ΄Ρ‹ΠΉ элСмСнт Π½Π° 2
const doubled = numbers.map(num => num * 2);

console.log(doubled); // [2, 4, 6, 8, 10]


πŸ—£οΈ Π’ этом ΠΏΡ€ΠΈΠΌΠ΅Ρ€Π΅:

β€’ map() примСняСт Ρ„ΡƒΠ½ΠΊΡ†ΠΈΡŽ ΠΊΠΎ всСм элСмСнтам массива
β€’ Π’ΠΎΠ·Π²Ρ€Π°Ρ‰Π°Π΅Ρ‚ Π½ΠΎΠ²Ρ‹ΠΉ массив с Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Π°ΠΌΠΈ
β€’ ИдСалСн для прСобразования Π΄Π°Π½Π½Ρ‹Ρ… (Π½Π°ΠΏΡ€ΠΈΠΌΠ΅Ρ€, ΡƒΠΌΠ½ΠΎΠΆΠ΅Π½ΠΈΠ΅, Ρ„ΠΎΡ€ΠΌΠ°Ρ‚ΠΈΡ€ΠΎΠ²Π°Π½ΠΈΠ΅).

CodeBase | Frontend | #JS

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The SSE was the first modern stock exchange to open in China, with trading commencing in 1990. It has now grown to become the largest stock exchange in Asia and the third-largest in the world by market capitalization, which stood at RMB 50.6 trillion (US$7.8 trillion) as of September 2021. Stocks (both A-shares and B-shares), bonds, funds, and derivatives are traded on the exchange. The SEE has two trading boards, the Main Board and the Science and Technology Innovation Board, the latter more commonly known as the STAR Market. The Main Board mainly hosts large, well-established Chinese companies and lists both A-shares and B-shares.

The STAR Market, as is implied by the name, is heavily geared toward smaller innovative tech companies, in particular those engaged in strategically important fields, such as biopharmaceuticals, 5G technology, semiconductors, and new energy. The STAR Market currently has 340 listed securities. The STAR Market is seen as important for China’s high-tech and emerging industries, providing a space for smaller companies to raise capital in China. This is especially significant for technology companies that may be viewed with suspicion on overseas stock exchanges.

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